Display screen or portion thereof with transitional graphical user interface



FIG. 1 is a front view of a display screen or portion thereof withtransitional graphical user interface showing a first image in asequence, showing our new design;

FIG. 2 is a front view showing a second image thereof;

FIG. 3 is a front view showing a third image thereof;

FIG. 4 is a front view showing a fourth image thereof; and,

FIG. 5 is a front view showing a fifth image thereof.

The appearance of the transitional image sequentially transitionsbetween the images shown in FIGS. 1-5. The process or period in whichone image transitions to another image forms no part of the claimeddesign.

The outer broken lines in the figures depict a display screen or portionthereof and form no part of the claimed design. The remainder of thebroken lines in the figures depict portions of the graphical userinterface that form no part of the claimed design.

CLAIM The ornamental design for a display screen or portion thereof withtransitional graphical user interface, as shown and described.